NetPlus-Ch07-v04
description
Transcript of NetPlus-Ch07-v04
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BCENT - Basic Cisco Entry Networking Technician
Chapter 7
Introducing Wide-Area Networks
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FOUNDATION TOPICS
•WAN Properties
•WAN Technologies
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INTRODUCING WIDE-AREA NETWORKS
• What are the categories of WAN connections?
• How are data rates measured on various WAN technologies?
• Which types of media might be used in WAN connections?
• What are the characteristics of different WAN technologies?
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INTRODUCING WIDE-AREA NETWORKS
• In the early 1990s, computer-networking design guides commonly invoked the Pareto Principle which stated that 80% of your traffic stays local while only 20% of your traffic leaves the local network. This was called the 80-20 rule.
• Today, network traffic patterns are more closely approximated with a 20-80 rule, meaning that most traffic leaves the LAN and travels across the WAN.
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WAN CONNECTION TYPES
• There are three general categories of WAN connections:
Dedicated Leased Line
Circuit-switched connection
Packet-switched connection
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DEDICATED LEASED LINE
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CIRCUIT-SWITCHED CONNECTION
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PACKET-SWITCHED CONNECTION
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WAN DATA RATES
• WAN bandwidth can be measured in kbps, Mbps, and Gbps, just like LAN bandwidth. It can also be measured using optical carrier (OC) levels.
OC Level Bandwidth
OC-1 51.84 Mbps
OC-3 155.52 Mbps
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WAN DATA RATES
WAN Technology Typical Available Bandwidth
Frame Relay 56 kbps – 1.544 Mbps
T1 1.544 Mbps
T3 44.736 Mbps
E1 2.048 Mbps
E3 34.4 Mbps
ATM 155 Mbps – 622 Mbps
SONET 51.84 Mbps (OC-1) –159.25 Gbps (OC-3072)
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WAN MEDIA TYPES
• Physical Media
Unshielded twisted pair (UTP)
Coaxial Cable
Fiber-optic cable
Electric power lines
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WAN MEDIA TYPES
• Wireless Media
Cellular phoneo Mobile hot spots
Satellite
WiMAX: Worldwide Interoperability for Microwave Access
HSPA+: Evolved High-Speed Packet Accesso Wireless broadband
Radio
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WAN TECHNOLOGIES
• Dedicated Leased Line
Typically a point-to-point connection between two sites.
All the bandwidth on that line is available to those sites.
Common digital circuits are:o T1, E1, T3 and E3 circuits
• These digital circuits are usually measured in 64-kbps channels called Digital Signal 0 (DS0)
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T-CARRIER SIGNAL LEVELS
Carrier Signal Level # of T1 signals # of Voice Channels
Speed
T1 DS1 1 24 1.544 Mbps
T1c DS1c 2 48 3.152 Mbps
T2 DS2 4 96 6.312 Mbps
T3 DS3 28 672 44.736 Mbps
T4 DS4 168 4032 274.760 Mbps
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CHANNEL SERVICE UNIT / DATA SERVICE UNIT (CSU/DSU)
CSU/DSU Terminating a Synchronous Circuit
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POINT-TO-POINT PROTOCOL (PPP)
• PPP is commonly used as a Layer 2 protocol on dedicated leased lines.
Simultaneously transmit multiple Layer 3 protocols.
Each Layer 3 Control Protocol runs an instance of PPP’s Link Control Protocol (LCP).
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POINT-TO-POINT PROTOCOL (PPP)
• Four primary features of LCP:
Multilink interface (bonding/load balancing)
Looped link detection
Error detection
Authenticationo PAP (password in cleartext – bad)
o CHAP (password is hashed – better)
o MS-CHAP (Microsoft enhanced with additional features)
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PAP
PAP Authentication
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CHAP
CHAP Authentication
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PPPOE
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DIGITAL SUBSCRIBER LINE (DSL)
• DSL is common in many residential and small office/home office (SOHO) locations
• DSL provides high-speed data transmission over existing telephone wiring.
• DSL has several variants, which differ in data rate and distance limitations.
• Asymmetric DSL (ADSL)
• Symmetric DSL (SDSL)
• Very High Bit-Rate DSL (VDSL)
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ADSL SAMPLE TOPOLOGY
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CABLE MODEM
• Cable television infrastructure contains both coaxial and fiber-optic cabling, which is called a hybrid fiber-coax (HFC) distribution network.
• Specific frequency ranges are used for upstream and downstream data transmission.
• The device in the home or office that transmits and receives over those frequencies is a cable modem.
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CABLE MODEM SAMPLE TOPOLOGY
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SYNCHRONOUS OPTICAL NETWORK (SONET)
• SONET is a Layer 1 technology that uses fiber-optic cabling as its media. It can be used for different Layer 2 technologies like Asynchronous Transfer Mode (ATM).
• The physical topology can be linear (like a bus network), but it is typically configured in a ring topology.
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SONET SAMPLE TOPOLOGY
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SATELLITE
• In remote or rural locations, DSL and cable modem connections are not always available. In those cases a satellite WAN connection can be an option.
• Two potential design problems should be considered:
Delay
Weather Conditions
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SATELLITE
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PLAIN OLD TELEPHONE SERVICE (POTS)
• The Public Switched Telephone Network (PSTN) is comprised of multiple telephone carriers from around the world.
• Analog connections (voice and data) using the PSTN are called Plain Old Telephone Service (POTS) connections.
• Dial-up modems have a maximum bandwidth of 56-kbps because they can only access one 64-kbps channel.
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DIAL-UP MODEM SAMPLE TOPOLOGY
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INTEGRATED SERVICES DIGITAL NETWORK (ISDN)
• Integrated Services Digital Network (ISDN) supports multiple 64-kbps channels on a single connection.
• ISDN circuits are classified as either a basic rate interface (BRI) or primary rate interface (PRI)
BRI – Offers a 128-kbps data path
PRI – Offers a 1.472 Mbps data path
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INTEGRATED SERVICES DIGITAL NETWORK (ISDN)
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FRAME RELAY
• Frame Relay offers widespread availability and relatively low cost compared to leased lines.
• Frame Relay sites are connected via virtual circuits (VC).
• Virtual circuits can be point-to-point or point-to-multipoint connections.
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FRAME RELAY SAMPLE TOPOLOGY
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ASYNCHRONOUS TRANSFER MODE (ATM)
Asynchronous Transfer Mode (ATM) is a Layer 2 WAN technology that operates using the concept of PVCs and SVCs.
ATM uses fixed-length cells as its protocol data unit (PDU).
An ATM cell contains a 48-byte payload and a 5-byte header.
5-Byte Header
48-Byte Payload
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ATM VIRTUAL CIRCUITS
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ATM SAMPLE TOPOLOGY
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MULTIPROTOCOL LABEL SWITCHING (MPLS)
• Multiprotocol Label Switching (MPLS) is a WAN technology used by service providers. MPLS is popular because it supports multiple protocols on the same network.
• MPLS can support both Frame Relay and ATM on the same MPLS backbone.
• MPLS also allows traffic to be dynamically routed based on load conditions and path availability.
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MPLS SAMPLE TOPOLOGY
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SUMMARY
•WAN Properties
•WAN Connection Types
Dedicated Leased line
Circuit-switched connection
Packet-switched connection
•WAN Media Types
Physical Media
Wireless Media
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SUMMARY
•WAN Technologies
Dedicated Leased Line
DSL
Cable Modem
SONET
Satellite
POTS
ISDN
Frame Relay
ATM
MPLS